Arrows = Move Z = Shoot X = Throw Serum Grenade Throw serum grenades at the mummies to transform them back into humans. Grenades have a recharge time, so shoot the mummies to fend them off while you wait. If a mummy grabs you, alternate between the right and left arrows rapidly to free yourself from his grip. Cure all of the mummified workers in a room to progress through the pyramid.